Is refueling difficult with compressed natural gas?
No. Refueling with compressed natural gas is simple and convenient. CNG pumps looks similar to gasoline or diesel pumps and utilize a fueling nozzle. These fueling nozzles lock onto the CNG receptacles, and form a leak-free seal, which prevents any spills or evaporative losses. (Even if a leak were to occur in a Natural Gas Vehicle fuel system, the natural gas would dissipate up into the air because it is lighter than air.) There are two basic types of CNG fueling equipment – fast-fill and time-fill. In fast-fill, the combination of a large compressor coupled with a high-pressure storage tank system (called a cascade) fills the tank in about the same amount of time it takes to fuel a comparable petroleum vehicle. A time-fill system does not have a storage system and has a much smaller (and less expensive) compressor. Customers using a time-fill often refuel their vehicles overnight.
